NUCLEAR ENERGY is one of the best alternatives for electric power generation in the United States because it provides one of the most economical, stable and reliable power source available to us at this time. There are 104 commercial nuclear reactors that generate approximately 20 % of the total electric energy in this country. There are three more nuclear power plants under construction that may start operation in the near future. One of the nuclear reactors is under construction at the Watts Bar Nuclear Plant in Tennessee and is scheduled to be completed in 2015.  On October 19, 2016 the Watts Bar Unit 2 was the first reactor to enter commercial operation since 1996. The other two nuclear units are being built by the Southern Company and are scheduled to be completed by 2016 and 2017. According to the US Department of Energy, the cost of electrical nuclear generation is 67 US dollars per megawatt hour (2007).